Rufous-tailed Xenops

The rufous-tailed xenops is 10 to 11 cm (3.9 to 4.3 in) long and weighs 12 to 13 g (0.42 to 0.46 oz). It has a thin straight bill. The sexes are alike. Adults have a mostly blackish brown face with a buff supercilium. Their crown is blackish brown with golden-buff feather shafts. Their back is dark rufescent brown with wide buff streaks that fade by the lower back. Their rump and uppertail coverts are rufescent. Their tail is dark rufous. Their wing coverts are blackish with rufescent brown edges and their flight feathers are blackish with a wide rufous band at their base. Voice: The rufous-tailed xenops' song is a short, fast, high-pitched trill that rises and falls as it increases and decreases in volume. Its call has not been described.